I want to swap from 2.73 to posi 3.42, I get about 19 in city now and not sure on highway but its better. What can i expect from highway and city after swap?

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89 camaro 305 tbi, flomaster 3 chamber cat back, gutted cat, Edlebrock TES Headers, Exhaust cutout, Edlebrock open element, 160 degree T-stat, and a Stage 2 FastChip.

2 kicker comp 12"'s, polk for the rest. Phoenix gold xs2300 to subs, kicker impulse 404XI to 4 speakers, pioneer DEH- P7000R head unit, and finally a 12 disc changer. Full leather interior from http://www.MrMikes.com

 

Around town, your mileage should be about the same. On the highway, it may decrease a bit. But, I've seen mileage go up with deeper gears. On the interstate, you may see a decrease in mileage. On normal highways(60-65), some engines run more efficient at the increased rpm and get better mileage. If you drive up and down hills, you can also see an increase in mileage since your car won't kick down into 3rd as easy or unlock the torque converter as easy.

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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro